Wang Khan

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This article is about Wang Khan Toghrul, ruler of the Kerait. For the Seljuk leader, see Toghrül.

Wang Khan, also Ong Khan, was the title given to the Kerait ruler Toghrul by the Jurchen Jin Dynasty of China. Like the rest of their tribe they were Nestorian Christian. Wang Khan was the blood brother of Genghis Khan's father Yesükhei, and he raised Genghis as his foster son after Yesükhei died. He is also believed to be the father of Genghis' wife, Börte. He was one of Genghis' early allies, but when Temujin attacked Jamuqa for the title of Gur Khan (universal ruler), Toghrul, fearing Temujin's growing power, plotted with Jamuqa to have him assassinated. He was killed in 1203 by Naiman soldiers who failed to recognize him, after fleeing from a defeat against Genghis Khan. According to William of Rubruck, Genghis Khan captured one of his daughters (Sorghaghtani Beki) and married her to his son (Tului), who by her gave birth to Mongke Khan.

During the 13th century, Wang Khan was identified with Prester John.